Flu shots are not too far away, so file this in your memory for when it's time to roll up your sleeve. Make sure you feel really rested before you go in for that shot.
Turns out, the shot works the best in people who get plenty of sleep. That's according to a study in the Journal of the American Medical Association which tested two dozen healthy people. Half were restricted to four hours of sleep a night, and the other half followed their regular sleep patterns.
10 days after they were all given flu shots, researchers tested their immune system response to the vaccine. They found the folks whose sleep was restricted had less than half the immunity of the others. And the study says even three and four weeks later, when patients were able to sleep normally again, the group whose sleep had been restricted before the shot still showed a weaker immune response.